Abstract
Nowadays there is an increasing request to realize green, eco-friendly, and biodegradable electronic devices for biosensor implementation. In this context, we have conceived and realized a green sensor based on localized surface plasmon resonance (LSPR) phenomenon in a thin-slab waveguide of bacterial cellulose (BC). These LSPR sensors can be obtained simply by gold sputtering on the slab BC waveguides. The performances have been studied investigating the presence of ionic liquids (ILs) inside and in absence of ILs with various thicknesses of the BC substrate. Depending of the thickness of the BC layer, the ILs effect on the LSPR can be constructive or destructive. In this work, we present a study of the sensor performances, in terms of bulk sensitivity and resolution by changing the aforementioned parameters. Analyses in terms of BC geometry are pursued in order to improve the interaction between the light and the LSPR phenomenon. The experimental setup used for this kind of extrinsic optical fiber LSPR sensor is based on two optical fibers used to connect a white light source and a spectrometer with the green LSPR sensor chip. Results evince the suitability of the proposed approach in order to realize sensors and biosensors with several intriguing properties and features. In fact, these LSPR platforms could be used to realize disposable biosensors, when a specific bioreceptor is covalently bonded to the gold.
Highlights
T HE realization of low-cost, disposable, and green sensors requires the development of new materials such as bioderived polymers
We will discuss about a green approach to realize a low-cost and disposable plasmonic sensor platform for biosensing, exploiting an extrinsic optical fiber configuration, used in transmission mode, based on an localized surface plasmon resonance (LSPR) sensor chip realized by a bacterial cellulose (BC) slab waveguide covered by gold
In [21], some of the authors have already tested an LSPR sensor based on thin BC paper with ions inside
Summary
T HE realization of low-cost, disposable, and green sensors requires the development of new materials such as bioderived polymers. We will discuss about a green approach to realize a low-cost and disposable plasmonic sensor platform for biosensing, exploiting an extrinsic optical fiber configuration, used in transmission mode, based on an LSPR sensor chip realized by a BC slab waveguide covered by gold. When specific bioreceptors are used in contact with the gold nanostructures, exploiting self-assembled monolayers (SAMs) of receptors, the high performances of the chosen LSPR-BC platform can be used to monitor different substances, on-site and in real time, by disposable green LSPR biosensors This aspect is important because disposable and low-cost biological and chemical sensors will be used in several application fields in the future (e.g., agriculture, food, environmental monitoring, security, and biomedical applications), with particular interest to green, biodegradable, and low-cost devices
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